a = [1]
b = [2]
c = [1,2,3]
cc = max(a,b,c)
print(cc)

re_dict = {
    1:1,
    2:2,
    3:3
}
print(re_dict)

print(re_dict.get(0))

for i in c:
    print(i)

# 列表合并
c = c+a
d = set(c)
for i in d:
    print(i)
print(d)